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A taxon is
Critically Endangered when the best available evidence indicates
that it meets any of the following criteria (A to E), and it is
therefore considered to be facing an extremely high risk of
extinction in the wild:
A.
Reduction in population size based on any of the following:
1)
An
observed, estimated, inferred or suspected population size reduction
of ≥ 90% over the last 10 years or three generations, whichever is
the longer, where the causes of the reduction are clearly reversible
AND understood AND ceased, based on (and specifying) any of the
following:
a) direct
observation
b) an
index of abundance appropriate to the taxon
c) a
decline in area of occupancy, extent of occurrence and/or quality of
habitat
d) actual
or potential levels of exploitation
e) the
effects of introduced taxa, hybridization, pathogens, pollutants,
competitors or parasites.
2)
An
observed, estimated, inferred or suspected population size reduction
of ≥ 80% over the last 10 years or three generations, whichever is
the longer, where the reduction or its causes may not have ceased OR
may not be understood OR may not be reversible, based on (and
specifying) any of the following:
a) direct
observation
b) an
index of abundance appropriate to the taxon
c) a
decline in area of occupancy, extent of occurrence and/or quality of
habitat
d) actual
or potential levels of exploitation
e) the
effects of introduced taxa, hybridization, pathogens, pollutants,
competitors or parasites.
3) A
population size reduction of ≥ 80%, projected or suspected to be met
within the next 10 years or three generations, whichever is the
longer (up to a maximum of 100 years), based on (and specifying) any
of the following:
a) an
index of abundance appropriate to the taxon
b) a
decline in area of occupancy, extent of occurrence and/or quality of
habitat
c) actual
or potential levels of exploitation
d) the
effects of introduced taxa, hybridization, pathogens, pollutants,
competitors or parasites
4)
An
observed, estimated, inferred, projected or suspected population
size reduction of ≥ 80% over any 10 year or three generation period,
whichever is longer (up to a maximum of 100 years in the future),
where the time period must include both the past and the future, and
where the reduction or its causes may not have ceased OR may not be
understood OR may not be reversible, based on (and specifying) any
of the following:
a) direct
observation
b) an
index of abundance appropriate to the taxon
c) a
decline in area of occupancy, extent of occurrence and/or quality of
habitat
d) actual
or potential levels of exploitation
e) the
effects of introduced taxa, hybridization, pathogens, pollutants,
competitors or parasites
B.
Geographic range in the form of either B1 (extent of occurrence) OR
B2 (area of occupancy) OR both:
1) Extent
of occurrence estimated to be less than 100 km2, and
estimates indicating at least two of a- c:
a)
Severely fragmented or known to exist at only a single location.
b)
Continuing decline, observed, inferred or projected, in any of the
following:
(i) extent
of occurrence
(ii) area
of occupancy
(iii) area,
extent and/or quality of habitat
(iv) number
of locations or subpopulations
(v) number
of mature individuals
c)
Extreme fluctuations in any of the following:
(i)
extent
of occurrence
(ii)
area
of occupancy
(iii) number
of locations or subpopulations
(iv) number
of mature individuals
2) Area
of occupancy estimated to be less than 10 km2, and
estimates indicating at least two of a-c:
a) Severely fragmented or known to exist at only a single location.
b)
Continuing decline, observed, inferred or projected, in any of the
following:
(i) extent
of occurrence
(ii) area
of occupancy
(iii)
area,
extent and/or quality of habitat
(iv)
number
of locations or subpopulations
(v) number
of mature individuals.
c)
Extreme fluctuations in any of the following:
(i)
extent
of occurrence
(ii)
area
of occupancy
(iii)
number
of locations or subpopulations
(iv)
number
of mature individuals
C.
Population size estimated to number fewer than 250 mature
individuals and either:
1) An
estimated continuing decline of at least 25% within three years or
one generation, whichever is longer, (up to a maximum of 100 years
in the future) OR
2) A
continuing decline, observed, projected, or inferred, in numbers of
mature individuals AND at least one of the following (a-b):
a)
Population structure in the form of one of the following:
(i) no
subpopulation estimated to contain more than 50 mature individuals,
OR
(ii)
at
least 90% of mature individuals in one subpopulation.
b)
Extreme fluctuations in number of mature individuals.
D.
Population size estimated to number fewer than 50 mature
individuals.
E. Quantitative
analysis showing the probability of extinction in the wild is at
least 50% within 10 years or three generations, whichever is the
longer (up to a maximum of 100 years).
List of
Critically Endangered birds:
|
Sr. No. |
Species |
Status |
|
1. |
Pink-headed Duck
Rhodonessa
caryophyllacea |
Critical D1 |
|
2. |
Himalayan Quail
Ophrysia
superciliosa |
Critical D1 |
|
3. |
White-backed or
White-rumped Vulture
Gyps bengalensis
|
Critical
A2b,c,e;
A4b,c,e
Vulnerable
C1 |
|
4. |
Long-billed or Indian
Vulture Gyps
indicus |
Critical
A2b,c,e; A4b,c,e |
|
5. |
Slender-billed Vulture Gyps
tenuirostris |
Critical A1c,e; A2c,e
Vulnerable C1 |
|
6. |
Siberian Crane
Grus leucogeranus |
Critical A3b,c,d; A4b,c,d
Vulnerable A2b,c,d; D2 |
|
7. |
Jerdon's Courser Rhinoptilus
bitorquatus |
Critical C2a(ii)
Endangered D1
Vulnerable B1a+b(iii) |
|
8. |
Forest Owlet
Heteroglaux
blewitti |
Critical C1; C2a
Endangered B1+2a,b,c,d,e; D1 Vulnerable D2 |
|
9. |
White-bellied Heron Ardea
insignis |
Critical C2a(i)
Endangered A3c,d; A4c,d; D1 Vulnerable A2c,d |
|
10. |
Red-headed Vulture Sarcogyps
calvus |
Critical A2a,b,c,e; A3b,c,e; A4a,b,c,e
Vulnerable C1 |
|
11. |
Bengal Florican
Houbaropsis
bengalensis |
Critical A3b,c,d; A4a,b,c,d
Endangered A2a,b,c,d
Vulnerable C1; C2a(i); D1 |
|
12. |
Sociable Lapwing
Vanellus gregarius
|
Critical A3b,c; ; A4b,c
Endangered A2b,c |
|
13. |
Spoon-billed Sandpiper
Eurynorhynchus pygmeus
|
Critical A2a,b,c,d; A3b,c,d; A4a,b,c,d
Endangered C2a(ii)
Vulnerable C1; D1 |
|
14. |
Christmas Frigatebird
Fregata andrewsi |
Critical
B2a+b(ii,iii,v)
Endangered
A2b,c,d,e; A3c,d,e; A4b,c,d,e; C2a(ii)
Vulnerable
C1; D2 |
|
Recent
additions to the list
(as per IUCN 2011 redlist): |
|
15. |
Great Indian Bustard
Ardeotis nigriceps |
Critical A2a,c,d,e; A4a,c,d,e; C1 Endangered
A3c,d,e; D1 |
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